1. This is the last tracking of your parcel on the China Post EMS site:

2016-12-21 00: 00: 00.0 15:29:00 Guangzhou City from the processing center, sent to USLAXP = ISC LOS ANGELES CA (USPS)

2. Your parcel is On Route/In Transit to USA Los Angeles. In Normal condition parcel to USA can take between 9 to 23 days to be deliver.

3. But I suspect your parcel might be delayed because of this.

4. When your parcel was sent it was not normal condition. Because:

Holiday Season
China Post has too many parcels to send overseas
Not enough room on the Aircraft for parcels
Smog in China delaying Aircraft or cancelling them
Rescheduling of mail bags

5. Just continue to track your parcel on the USPS site for any new movement.

Thanks.